Stamp.



J. H. MATTHEWS & J. STEIN. STAMP.

APPLICATION FILED MAY 12, 1913.

Patented Dec. 16, 1913.

2 SHEETS-SHEET 1.

mJJMBlA PLANOGRAPH 60., WASHINGTON, D4 c.

, i rs- J. H. MATTHEWS J. STEIN.

STAMP.

APPLICATION FILED MAY 12, 1913.

1,0813%. Patented Dec. 16,1913.

2 SHEETS-SHEET 2.

COLUMBIA PLANOGRAPN co WASHINGTON. D. c.

JAMES H. MATTHEWS AND JOSEPH STEIN,

OBS TO JAS. H. MATTHEWS & 00., TION OF PENNSYLVANIA.

ETD.

STAMP.

Specification'of Letters Patent.

Patented Dec. 16,1913.

Application filed May 12, 1913. Serial No. 767,001.

T 0 all whom it may concern Be it known that we, JAMES H. li Lirrnnu sand JOSEPH STEIN, citizens of the United States, and residing in thecity of Pittsburgh, in the county of Allegheny and State ofPennsylvania, have invented or discovcred new and useful Improvements inStamps, of which the following is a specification.

Our invention consists in new and useful improvements in rocker-stampswhich are used to stamp or mark plane surfaces, such, for instance, asmetal sheets or bars. Such stamps are provided with a convex impressionface upon which is mounted the rubber die consisting of a sheet or platewith the proper raised characters. It has been the general custom tosecure the die to the 1mpression face by means of cement, but thenecessary cleaning of the die to remove excess ink tends to loosen thesame, and a separate stamp must be provided for each die. To avoid thesedifficulties, we provide means for detachably mounting the die on thestamp, thus enabling the same stamp to be used with a plurality ofdifferent dies and also enabling the die to be cleansed withoutloosening it from the stamp. A. bed or sheet of relatively soft rubberis preferably interposed between the die and the impression face of thestamp.

The die is held in place on the stamp by means of an open frame Which weshow pivoted at one end of the impression face and whose other end isclampable at the other end of the impression frame, the body of theframe being stretched down snugly on the die, holding it flat on theimpression face. The frame also prevents the adhesion of the inkedrubber to the surface being printed from resulting in buckling ortearing loose of the die. Resiliently mounted dowel-pins extend outthrough the impression face and engage holes in said bed and die toproperly position the same and prevent the slipping of the latter whilethe frame is being clamped down. Means are also provided for holding theframe out of contact with the surface being marked, thus preventing theblurring or improper inking of said surface.

In the accompanying drawings, Figure 1 is a face plan view of ourimproved stamp; Fig. 2 is a sectional view of the same along the lineIIII in Fig. 1; Fig. 3 is a perspective of the frame dismounted; Fig. ris an enlarged broken section along the line I.VTV in Fig. 1; and Fig. 5is a similar view along the line VV in Fig. 1.

The following a detailed description of the drawings. A represents arocker stamp having a convex impression face 1, a back plate 2 and handgrasps 3.

B is a sheet of relatively soft rubber placed on said impression face asa bed for the die C. The die C is a sheet or plate of rubber or similarmaterial having on its face the desired raised characters 4: which areto be printed on the surface marked.

represents one or more holes through the impression face 1 through whichextends the dowel-pin 6 resiliently mounted in any convenient manner, asby being supported on leaf-spring 7 secured to the under side of theimpression face. Said pin extends up through registering holes in thebed B and the die C, the hole in die C being provided with an eyelet 8to prevent tearing or wear. XVhen the frame D is clamped in place, thedowel-pins are depressed so as not to interfere with the snug fit of theframe down on the die.

D is a fiat metal open frame composed of end bars 9 and two or more sideor cross bars 10. The material of said frame is preferably somewhatresilient so as to conform, when clamped in place, to the curve of theimpression face. One of the end bars 9 is provided with a pair of curvedears 11 which are hooked over a rod 12 which is supported from one endof the stamp by means of brackets 18. The frame D is thus detachablypivoted to one end of the impression face. The other end bar 9 isprovided with curved ears 14 which are adapted to hook over the rock bar15 supported at the other end of the impression face 1 by means ofbrackets 16. The ends of bar 15 are cylindrical to be journaled in saidbrackets while the body of said bar is a parallelogram in cross section,One axis being of greater length than the other.

17 is a thumb-piece secured to the bar 15 by means of which itmay beturned.

When the longer axis of the bar 15 is at right angles to the impressionface 1, the ears 14 slip down easily over said bar, but when said bar isthrown into the position shown in Figs. 2 and 4, said bar clamps saidears firmly and stretches the frame D down tightly upon the die C whichis thus flattened out and held snugly on the impression face. It isevident that the throwing of the bar 15 back into the position firstabove described, releases the ears Hand permits the frame D to be swungup out of the way for the removal of the die.

Unless provision is made to prevent the same, the compression of thedie, while being rocked over the surface being printed, may result incontact between the frame D and the said surface. As said frameis moreor less smeared with ink, this would result in smearing and disfiguringsaid surface. To prevent this, we provide the bars 9 and 10 with aplurality of conical projections 18 which are adapted to contact withsaid surface and space the frame D away therefrom. The points of saidprojections make little or no impression or mark.

What we desire to claim is 1. In combination with a rocker stamp havingan impression face, dowel pins extending outwardly from said impressionface, a flexible die laid upon said impression faceand provided withpositioning holes engaged by said dowel pins, and an open metal frameadapted to be clamped down on said impression face, said frame bearingon said dowel pins and on the nonprinting portion of said die, for thepurposes described.

2. In combination with a rocker stamp having an impression face,resiliently extended dowel pins extending outwardly from said impressionface, a flexible die laid upon said impression face and provided withpositioning holes through which said dowel pins extend, and an openmetal frame adapted to be clamped down on said impression face, saidframe bearing on the nonprinting portion of said die and depressing saiddowel pins, for the purposes described.

In combination with a stamp having a convex impression face, a flexibledie mounted on said face, a holding frame pivoted at one end of saidimpression face and pro vided with curved ears on its free end, and arocking eccentric locking-bar journaled at the other end of said faceand adapted to engage said ears and clamp said frame down upon said die.

4. In combination with a stamp having a convex impression face, aflexible die mounted on said face, a holding frame pivoted at one end ofsaid impression face and provided with curved ears on its free end, anda rocking eccentric locking-bar, of rectangular cross-section, journaledat the other end of said face and adapted to engage said ears and clampsaid frame down upon said die.

Signed at Pittsburgh, Penna, this 10th day of May, 1913.

JAMES H. MATTHEWS. JOSEPH STEIN.

Witnesses:

E. A. LAWRENCE, IV. S. VVALsH.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Eatents. Washington, D. C.

